Save image and resize image

save and resize image

 public string SavePictureApiPath(string mimeType, int productId, byte[] pictureBinary)
        {
            //string lastPart = GetFileExtensionFromMimeType(mimeType);
            string lastPart = "jpg";
            string fileName = string.Format("{0}.{1}",productId, lastPart);

            string path = Path.Combine(CommonHelper.MapPath("~/reader/new-epubs/coverpage/"), fileName);

            byte[] resizePictureBinary;

            ReSizeImage(pictureBinary, 550, productId, out resizePictureBinary);

            File.WriteAllBytes(path, resizePictureBinary);
            

            return null;
        }
        
        
        
           private void ReSizeImage(byte[] pictureBinary, int targetSize, int productId ,out byte[] resizePictureBinary)
        {
            using (var stream = new MemoryStream(pictureBinary))
            {
                Bitmap b = null;
                try
                {
                    //try-catch to ensure that picture binary is really OK. Otherwise, we can get "Parameter is not valid" exception if binary is corrupted for some reasons
                    b = new Bitmap(stream);
                }
                catch (ArgumentException exc)
                {
                    _logger.Error(string.Format("Error generating picture thumb. ID={0}", productId),
                        exc);
                }

                if (b == null)
                {
                    //bitmap could not be loaded for some reasons
                  
                }

                using (var destStream = new MemoryStream())
                {
                    var newSize = CalculateDimensions(b.Size, targetSize);
                    ImageBuilder.Current.Build(b, destStream, new ResizeSettings
                    {
                        Width = newSize.Width,
                        Height = newSize.Height,
                        Scale = ScaleMode.Both,
                        Quality = _mediaSettings.DefaultImageQuality
                    });
                    resizePictureBinary = destStream.ToArray();
                    b.Dispose();
                }
            }

        }
        
           protected virtual Size CalculateDimensions(Size originalSize, int targetSize,
            ResizeType resizeType = ResizeType.LongestSide, bool ensureSizePositive = true)
        {
            float width, height;

            switch (resizeType)
            {
                case ResizeType.LongestSide:
                    if (originalSize.Height > originalSize.Width)
                    {
                        // portrait
                        width = originalSize.Width * (targetSize / (float)originalSize.Height);
                        height = targetSize;
                    }
                    else
                    {
                        // landscape or square
                        width = targetSize;
                        height = originalSize.Height * (targetSize / (float) originalSize.Width);
                    }
                    break;
                case ResizeType.Width:
                    width = targetSize;
                    height = originalSize.Height * (targetSize / (float)originalSize.Width);
                    break;
                case ResizeType.Height:
                    width = originalSize.Width * (targetSize / (float)originalSize.Height);
                    height = targetSize;
                    break;
                default:
                    throw new Exception("Not supported ResizeType");
            }

            if (ensureSizePositive)
            {
                if (width < 1)
                    width = 1;
                if (height < 1)
                    height = 1;
            }

            //we invoke Math.Round to ensure that no white background is rendered - http://www.nopcommerce.com/boards/t/40616/image-resizing-bug.aspx
            return new Size((int)Math.Round(width), (int)Math.Round(height));
        }